US7879086B2 - Medical device having a coating comprising an adhesion promoter - Google Patents

Medical device having a coating comprising an adhesion promoter Download PDF

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Publication number
US7879086B2
US7879086B2 US11/409,468 US40946806A US7879086B2 US 7879086 B2 US7879086 B2 US 7879086B2 US 40946806 A US40946806 A US 40946806A US 7879086 B2 US7879086 B2 US 7879086B2
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Prior art keywords
coating
stent
region
coating composition
adhesion promoter
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US11/409,468
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US20070250159A1 (en
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Liza J Davis
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Boston Scientific Scimed Inc
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Boston Scientific Scimed Inc
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Priority to US11/409,468 priority Critical patent/US7879086B2/en
Assigned to BOSTON SCIENTIFIC SCIMED, INC. reassignment BOSTON SCIENTIFIC SCIMED, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAVIS, LIZA
Priority to CA002649695A priority patent/CA2649695A1/en
Priority to JP2009506630A priority patent/JP2009534109A/ja
Priority to EP07755889A priority patent/EP2010243A1/en
Priority to PCT/US2007/009805 priority patent/WO2007124137A1/en
Publication of US20070250159A1 publication Critical patent/US20070250159A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L31/16—Biologically active materials, e.g. therapeutic substances
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/14—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0035—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in release or diffusion time
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0067—Means for introducing or releasing pharmaceutical products into the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
    • A61L2300/404—Biocides, antimicrobial agents, antiseptic agents
    • A61L2300/406—Antibiotics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
    • A61L2300/416—Anti-neoplastic or anti-proliferative or anti-restenosis or anti-angiogenic agents, e.g. paclitaxel, sirolimus
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/60—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a special physical form
    • A61L2300/606—Coatings
    • A61L2300/608—Coatings having two or more layers
    • A61L2300/61—Coatings having two or more layers containing two or more active agents in different layers

Definitions

  • This invention relates generally to a medical device, such as an intravascular stent, having a coating disposed on at least a portion of the medical device. More particularly, this invention is directed to a coating in which the coating comprises a first coating region comprising an adhesion promoter and a therapeutic agent. The coating can also include a second coating region which is substantially free of the adhesion promoter or any adhesion promoter. The invention is also directed to a method for manufacturing such a coated medical device.
  • a variety of medical conditions are treated by introducing an insertable or implantable medical device into the body.
  • exposure to a medical device which is implanted or inserted into the body of a patient can cause the body tissue to exhibit adverse physiological reactions.
  • the insertion or implantation of certain catheters or stents can lead to the formation of emboli or clots in blood vessels.
  • the implantation of urinary catheters can cause infections, particularly in the urinary tract.
  • Other adverse reactions to medical devices include, without limitation, cell proliferation which can lead to hyperplasia, occlusion of blood vessels, platelet aggregation, rejection of artificial organs, and calcification.
  • therapeutic agents In order to address such adverse effects, medical devices have included therapeutic agents. Such materials can be incorporated into the materials used to make the device. Alternatively, the therapeutic agents can be included in a coating that is applied to a surface of the medical device.
  • medical devices that include a therapeutic agent can be used for direct or local administration of the therapeutic agent to a particular part of the patient's body.
  • stents having coatings that include a therapeutic agent can be used to treat or prevent restenosis.
  • the coating can also include a polymeric material that affects the delivery or release of the therapeutic agent.
  • various types of coated stents in which the coating includes a therapeutic agent have been used for localized delivery of such therapeutic agent to a body lumen. See, e.g., U.S. Pat. No. 6,099,562 to Ding et al.
  • Such direct or local administration may be more preferred than systemic administration of a therapeutic agent.
  • Systemic administration requires larger amounts and/or higher concentrations of the therapeutic agent because of indirect delivery of such agents to the afflicted area.
  • systemic administration may cause side effects which may not be a problem when the therapeutic agent is locally administered.
  • the present invention provides a coating for medical devices in which the release profile of a therapeutic agent from the coating can be controlled or modified.
  • the coatings of the present invention include an adhesion promoter that affects the release profile of the therapeutic agent from the coating.
  • the adhesion promoter enhances the adhesion of a coating composition on a medical device and thereby affects the release profile of the therapeutic agent of the coating composition.
  • the adhesion promoter can reduce the release of the therapeutic coating.
  • a medical device coating in which the rate or profile of release of a therapeutic agent from different regions of the medical device can be varied.
  • the therapeutic agent can be selectively released from these certain regions at a rate or profile that is different from the rate or profile of release of the therapeutic agent from other regions of the coating.
  • the invention relates to an implantable stent comprising an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a coating disposed on the stent structure.
  • the coating has a first coating region disposed on a first region of the stent structure, wherein the first coating region comprises a first coating composition comprising a first adhesion promoter and a second coating composition comprising a first therapeutic agent disposed upon the first coating composition.
  • the coating also has a second coating region disposed on a second region of the stent structure, wherein the second coating region comprises a third coating composition comprising a second therapeutic agent, and wherein the third coating composition is substantially free of the adhesion promoter.
  • the second coating region is free of any adhesion promoter.
  • the first adhesion promoter reduces the rate of release of the first therapeutic agent from the first coating region such that the rate of release of the first therapeutic agent from the first coating region is less than the rate of release of the second therapeutic agent from the second coating region.
  • the second coating region further comprises a fourth coating composition disposed between the second region of the stent structure and the third coating composition, wherein the fourth coating composition comprises a second adhesion promoter.
  • the first and second coating regions conform to the stent structure so as to preserve the openings of the stent structure.
  • each of the one or more coating compositions are the same. In other embodiments, each of the one or more coating compositions are different. In some embodiments, the first coating region is contiguous with the second coating region. In other embodiments, each coating composition can comprise one or more layers.
  • the adhesion promoter comprises parylene, copolymers of styrene and ethylene/butylene (e.g. Kraton 1901), iridium oxide or sulfonated styrene isobutylene copolymers. In some embodiments, the adhesion promoter is less than 10 weight percent of the coating composition. In certain embodiments, the one or more therapeutic agents are the same. In other embodiments, the one or more therapeutic agents are different. In particular embodiments, the therapeutic agent is about 0.01 to about 60 weight percent of the coating composition. In certain embodiments, the one and/or more therapeutic agents comprises paclitaxel, rapamycin, everolimus, tacrolimus or pimecrolimus. In other embodiments, the one and/or more therapeutic agents comprises an antibiotic or anti-restenotic agent. In still other embodiments, the one and/or more therapeutic agents comprises a therapeutic agent that inhibits smooth muscle cell proliferation, contraction, migration or hyperactivity.
  • the one or more therapeutic agents comprises a therapeutic agent that inhibits
  • the one or more coating compositions can comprise a polymer which can be the same polymer.
  • the stent structure comprises a metal.
  • the stent structure is balloon-expandable.
  • the stent structure comprises two end portions and a middle portion disposed between the two end portions, wherein the first region of the stent structure is an end portion and the second region of the stent structure is the middle portion.
  • the stent is a bifurcation stent, i.e. a stent intended to treat bifurcated vessels.
  • the stent is a bifurcation stent wherein the second region of the stent structure is the region that covers the side branch ostium.
  • the invention pertains to an implantable medical device, such as a stent.
  • the stent comprises an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient and a coating disposed on the sidewall stent structure.
  • the coating has a first coating region disposed on a first region of the stent structure.
  • the first coating region comprises a first coating composition comprising an adhesion promoter and a second coating composition comprising a therapeutic agent disposed upon the first coating composition.
  • the coating also has a second coating region, which is contiguous with the first coating region, disposed on a second region of the stent structure.
  • the second coating region comprises the second coating composition, and the second coating region is substantially free of any adhesion promoter.
  • the medical device is an implantable stent that is an intravascular, metallic, balloon-expandable sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a coating disposed on the sidewall stent structure having a first coating region disposed on a first region of the stent structure, wherein the first coating region comprises a first coating composition comprising an adhesion promoter and a second coating composition comprising an anti-restenotic agent disposed upon the first coating composition.
  • There is a second coating region which is contiguous with the first coating region, disposed on a second region of the stent structure.
  • the second coating region comprises the second coating composition, and the second coating region is substantially free of any adhesion promoter.
  • the first and second coating regions conform to the openings of the sidewall stent structure so as to preserve the openings.
  • the medical device of the invention is an implantable stent comprising an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a coating disposed on the sidewall stent structure having a first coating region disposed on a first region of the stent structure.
  • the first coating region comprises a first coating composition comprising a first adhesion promoter and a first therapeutic agent.
  • the second coating region is disposed on a second region of the stent structure, wherein the second coating region comprises a second coating composition comprising a second adhesion promoter and a second therapeutic agent.
  • the first adhesion promoter reduces the rate of release of the first therapeutic agent from the first coating region such that the rate of release of the first therapeutic agent from the first coating region is less than the rate of release of the second therapeutic agent from the second coating region.
  • the first and second coating regions conform to the openings of the sidewall stent structure so as to preserve the openings.
  • the first coating region is contiguous with the second coating region.
  • the first and second adhesion promoter are the same and in other embodiments they are different.
  • the weight percent of the adhesion promoter in the first coating composition is different from that of the second coating composition.
  • the therapeutic agents may comprise paclitaxel, rapacamycin, everolimus, tacrolimus, or pimecrolimus.
  • the therapeutic agent may comprise an antibiotic or an anti-restenotic agent.
  • the therapeutic agent may inhibit smooth muscle cell proliferation, contraction, migration, or hyperactivity.
  • the stent structure may comprise two end portions and a middle portion disposed between the two end portions, and wherein the first region of the stent structure is an end portion and the second region of the stent structure is the middle portion.
  • the stent may be a bifurcation stent.
  • the stent is a bifurcation stent wherein the second region of the stent structure is the region that covers the side branch ostium.
  • the medical device is an implantable stent comprising an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a coating disposed on the sidewall stent structure having a first coating region disposed on a first region of the stent structure, wherein the first coating region comprises a first coating composition comprising a first adhesion promoter, a polymer and an anti-restenotic agent.
  • the first adhesion promoter reduces the rate of release of the anti-restenotic agent from the first coating region such that the rate of release of the anti-restenotic agent from the first coating region is less than the rate of release of the anti-restenotic agent from the second coating region.
  • the medical device is an implantable stent that comprises an intravascular, metallic, balloon-expandable sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a coating disposed on the sidewall stent structure having a first coating region disposed on a first region of the stent structure.
  • the first coating region comprises a first coating composition comprising a first adhesion promoter, a polymer and/or an anti-restenotic agent.
  • the first adhesion promoter reduces the rate of release of the anti-restenotic agent from the first coating region such that the rate of release of the anti-restenotic agent from the first coating region is less than the rate of release of the anti-restenotic agent from the second coating region.
  • the first and second coating regions conform to the sidewall stent structure so as to preserve the openings therein.
  • the invention is directed to a method for coating an implantable stent comprising a stent having an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • the first coating region on a first region of the stent structure is formed by disposing a first coating composition comprising a first adhesion promoter on the first region of the stent structure.
  • the second coating composition is formed by disposing a first therapeutic agent onto the first coating composition.
  • a second coating region on a second region of the stent structure is created by disposing a third coating composition comprising a second therapeutic agent onto the second region of the stent structure.
  • the third coating composition is substantially free of the adhesion promoter or free of any adhesion promoter.
  • the method is claimed where the second coating region is substantially free of any adhesion promoter.
  • the first adhesion promoter reduces the rate of release of the first therapeutic agent from the first coating region such that the rate of release of the first therapeutic agent from the first coating region is less than the rate of release of the second therapeutic agent from the second coating region.
  • there is a fourth coating composition comprising a second adhesion promoter disposed onto the second region of the stent structure prior to disposing the third composition onto the fourth composition.
  • the first and second coating regions conform to the sidewall stent structure so as to preserve the openings therein.
  • the second and third coating compositions are the same.
  • the first coating region is contiguous with the second coating region.
  • the coating compositions can consist of one or more layers.
  • the one or more therapeutic agents are the same.
  • the one or more coating compositions comprise a polymer, which can be the same polymer.
  • the stent structure comprises two end portions and a middle portion disposed between the two end portions, wherein the first region of the stent structure is an end portion and the second region of the stent structure is the middle portion.
  • the stent is a bifurcation stent wherein the first region of the stent structure is the region that covers the side branch ostium.
  • the method for coating an implantable stent comprises a stent having an intravascular sidewall stent structure having openings therein and designed for permanent implantation into a blood vessel of a patient.
  • a first coating region is formed on a first region of the stent structure by disposing a first coating composition comprising a first adhesion promoter and a first therapeutic agent on the first region of the stent structure.
  • a second coating region is formed on a second region of the stent structure by disposing a second coating composition comprising a second adhesion promoter and a second therapeutic agent onto the second region of the stent structure.
  • the first adhesion promoter reduces the rate of release of the first therapeutic agent from the first coating region such that the rate of release of the first therapeutic agent from the first coating region is less than the rate of release of the second therapeutic agent from the second coating region.
  • the first and second coating regions conform to the sidewall stent structure so as to preserve the openings therein.
  • the second and third coating compositions are the same.
  • the first coating region is contiguous with the second coating region.
  • the first and second adhesion promoters are the same.
  • the weight percent of the adhesion promoter in the first coating composition is different from the weight percent of the adhesion promoter in the second coating composition.
  • the first and second therapeutic agents are the same.
  • the first and/or second coating composition comprise a polymer.
  • the stent structure comprises two end portions and a middle portion disposed between the two end portions, and wherein the first region of the stent structure is an end portion and the second region of the stent structure is the middle portion.
  • the stent is a bifurcation stent wherein the first region of the stent structure is the region that covers the side branch ostium.
  • FIG. 1 shows an example of an intravascular stent having a middle portion disposed between two end portions.
  • FIG. 2 shows an example of a bifurcation stent.
  • FIG. 3 is a cross-sectional view of a coating having a region containing an adhesion promoter and a contiguous region that is substantially free of any adhesion promoter.
  • FIGS. 4A-4B shows a method for making the coating of FIG. 3 .
  • FIGS. 5A-5D shows other methods for making the coatings of the present invention.
  • FIG. 6 shows an embodiment of a coating of the present invention where two contiguous regions of the coating each contain an adhesion promoter.
  • FIG. 7 shows another embodiment of the coating of the present invention where two contiguous regions of the coating each contain an adhesion promoter.
  • FIG. 1 shows an example of a medical device that is suitable for use in the present invention.
  • This figure shows an implantable intravascular stent 10 comprising a sidewall 11 which comprises a plurality of struts 13 and at least one opening 15 in the sidewall 11 .
  • the openings 15 are disposed between adjacent struts 13 .
  • This embodiment is an example of a stent where the struts and openings of the stent define a sidewall stent structure having openings therein.
  • the sidewall 11 may have a first sidewall surface 16 and an opposing second sidewall surface, which is not shown in FIG. 1 .
  • the first sidewall surface 16 can be an outer sidewall surface, which faces the body lumen wall when the stent is implanted, or an inner sidewall surface, which faces away from the body lumen wall.
  • the second sidewall surface can be an outer sidewall surface or an inner sidewall surface.
  • the stent 10 comprises a middle portion x and two end portions y and z. Generally, the end portions comprise about 20% or less of the overall length of the stent.
  • FIG. 2 shows an example of another medical device that is suitable for the present invention.
  • this figure shows an example of a bifurcation stent 90 , such as one that is suitable for treating abdominal aortic aneuryms.
  • FIG. 2 is a view of a bifurcation stent 90 consisting of a trunk 92 , a first illiac leg 94 , and a second illiac leg 96 , that both stem from the bifurcation region of the stent 93 and are separated at the ostium 95 .
  • the stent struts on the second illiac leg 96 of the stent make up the petal region.
  • FIG. 3 shows an embodiment of the present invention. More specifically, FIG. 3 is a cross-sectional view of a part of a medical device 10 .
  • the medical device has a first region 12 and a second region 14 .
  • a coating 20 having a first coating region 22 and a second coating region 24 is disposed on the medical device.
  • a first coating region 22 is disposed on the first region of the medical device 12
  • a second coating region 24 is disposed on a second region of the medical device 14 .
  • the first region of the medical device 12 can be an end portion of a stent and the second region of the medical device 14 can be the middle portion of the stent.
  • the first region can be the middle portion of a stent and the second region can be an end portion.
  • the first and second coating regions 22 , 24 are contiguous or in contact with each other.
  • the first and second coating regions 22 , 24 may be separated or spaced apart.
  • the first and second coating regions conform to the sidewall stent structure so as to preserve the openings therein.
  • the first coating region 22 comprises a first coating composition 30 , which can form a layer.
  • the first coating composition 30 comprises an adhesion promoter 32 .
  • the first coating composition 30 in some embodiments can include a therapeutic agent and/or a polymer.
  • the first coating region 22 also includes a second coating composition 40 , which is disposed on the first coating composition 30 .
  • the second coating composition 40 can form a layer.
  • the second coating composition 40 comprises a first therapeutic agent 42 and can also include a polymer 44 . In certain embodiments, if there is a polymer in the first coating composition it can be the same or different from the polymer 44 of the second coating composition 40 .
  • the second coating composition 40 can include an adhesion promoter.
  • the first coating region 22 can include more than two coating compositions comprising an adhesion promoter, a polymer, and/or a therapeutic agent. The first coating region 22 can have more than two layers comprising combinations of adhesion promoters, polymers, and/or therapeutic agents that are identical or different.
  • the second coating region 24 comprises a third coating composition 50 , which may form a layer.
  • the third coating composition 50 comprises a second therapeutic agent 52 , which may be the same as the first therapeutic agent 42 of the second coating composition 40 .
  • the second therapeutic agent 52 of the third coating composition 50 is different from the first therapeutic agent 42 of the second coating composition 40 .
  • the third coating composition 50 can also include a polymer 54 , which can be the same as or different from the polymer in the first composition 30 or the polymer 44 in the second composition 40 .
  • the third coating composition 50 of the second coating region 24 is substantially free of the adhesion promoter 32 or any adhesion promoter, i.e.
  • the third coating composition 50 can contain the same or a different adhesion promoter than used in the first coating composition 30 .
  • the second and third coating composition can be the same, i.e. contain the same constituents in the same amounts.
  • the second coating region 24 can include more than one coating composition comprising an adhesion promoter, a polymer and/or a therapeutic agent.
  • the second coating region 24 can have layers comprising combinations of adhesion promoters, polymers, and/or therapeutic agents that are identical or different.
  • the one or more coating compositions in the first coating region 22 and the second coating region 24 can be identical or different.
  • a coating region containing an adhesion promoter can be disposed at specific locations on a medical device where reduced release of the therapeutic agent is desired.
  • the first coating region can be disposed on an end portion of a stent, where reduced release may be desired, and the second coating region can be disposed on the middle portion of the stent.
  • the adhesion promoter reduces the rate of release of the first therapeutic agent from the first coating region such that the rate of release of the first therapeutic agent from the first coating region is less that the rate of release of the second therapeutic agent from the second coating region.
  • the medical device is a stent, such as an intravascular stent, that has a sidewall stent structure with openings therein
  • the first and/or second coating regions conform to the sidewall stent structure so as to preserve the openings therein.
  • FIGS. 4A and 4B illustrates an exemplary method of making the coated medical device of the present invention.
  • FIG. 4A shows a first region 12 and a second region 14 of a medical device 10 .
  • a first coating composition 30 is disposed on the first region 12 to form part of a first coating region 22 .
  • the first coating composition 30 comprises an adhesion promoter 32 .
  • FIG. 4B shows a subsequent step in the method.
  • a second coating composition 40 disposed on the first coating composition 30 to form a first coating region 22 disposed on the first region 12 .
  • the second coating composition 40 is the same as the coating composition used to form a second coating region 24 .
  • the second coating composition 40 is also used to form the second coating region 24 .
  • the second coating composition 40 comprises a therapeutic agent 42 and an polymer 44 . This second coating composition 40 can be applied to the first coating composition 30 before the second coating composition 40 is used to form the second coating region 24 or vice versa.
  • the coating compositions can be applied by any method to the medical device.
  • suitable methods include, but are not limited to, spraying such as by conventional nozzle or ultrasonic nozzle, dipping, rolling, electrostatic deposition, ink-jet coating and a batch process such as air suspension, pan-coating or ultrasonic mist spraying.
  • more than one coating method can be used to apply a coating composition onto the medical device.
  • the coating compositions are formed by combining the constituents of the composition, e.g. adhesion promoter, polymer and/or therapeutic agent.
  • Solvents that may be used to prepare the coating compositions, particularly ones that include a polymer. Examples of suitable solvents include, but are not limited to, tetrahydrofuran, methylethylketone, chloroform, toluene, acetone, isooctane, 1,1,1 trichloroethane, dichloromethane, isopropanol, IPA, and mixture thereof.
  • FIGS. 5A-5D show other embodiments for making the coated medical device of the present invention.
  • FIG. 5A shows a first region 12 and a second region 14 of a medical device 10 .
  • a first coating composition 30 is disposed on the first region 12 to form part of a first coating region 22 .
  • the first coating composition 30 comprises an adhesion promoter 32 .
  • FIG. 5B shows a subsequent step in the method.
  • a second coating composition 40 is disposed on the first coating composition 30 disposed on the first region of a medical device 12 .
  • the second coating composition 40 comprises a therapeutic agent 42 and a polymer 44 . If a polymer is used in the first coating composition 30 , it can be the same as or different from the polymer 44 of the second coating composition 40 .
  • FIG. 5C shows the next step in the method.
  • the second coating composition 40 which was disposed on the first coating composition 30 , is disposed on the second region 14 of the medical device 10 to form the second coating region 24 .
  • FIGS. 5B-5C shows that the second coating composition 40 is disposed over the first coating composition 30 before it is used to form the second coating region 24 , the second coating composition 40 can be used to form the second coating region 24 before it is disposed on the first coating composition 30 .
  • FIG. 5D shows an alternative to the step shown in FIG. 5C .
  • This figure shows an embodiment where a third coating composition 50 used to form the second coating region 24 is different from the second coating composition 40 .
  • the third coating composition 50 may form a layer.
  • the third coating composition 50 comprises a second therapeutic agent 52 , which may be the same as the first therapeutic agent 42 of the second coating composition 40 .
  • the second therapeutic agent 52 of the third coating composition 50 is different from the first therapeutic agent 42 of the second coating composition 40 .
  • the third coating composition 50 can include a polymer 44 .
  • the polymer 44 of the third coating composition 50 can be the same as or different from the polymer(s) of the first or second coating compositions.
  • the third coating composition 50 is substantially free of the adhesion promoter or any adhesion promoter, i.e. contains less than 1% by weight of an adhesion promoter, or is free of any adhesion promoter.
  • FIG. 6 shows yet another embodiment of a coated medical devices of the present invention.
  • a medical device 10 comprises a first region 12 and a second region 14 .
  • a first coating region 22 comprises a first coating composition 30 , which can form a layer.
  • the first coating composition 30 comprises an adhesion promoter 32 and in certain embodiments, such as the one depicted, a first polymer 34 .
  • the first coating composition in some embodiments can include a therapeutic agent.
  • the first coating region 22 also includes a second coating composition 40 , which is disposed on the first coating composition 30 .
  • the second coating composition 40 can form a layer.
  • the second coating composition 40 comprises a first therapeutic agent 42 and can also include a second polymer 44 .
  • the first polymer 34 of the first coating composition 30 can be the same as the second polymer 44 of the second coating composition 40 .
  • the first polymer 34 of the first coating composition 30 can be different from the second polymer 44 of the second coating composition 40 .
  • the second coating composition 40 can also include an adhesion promoter which is the same as or different from the adhesion promoter 32 in the first coating composition 30 .
  • the coating also comprises a second coating region 24 .
  • the first and second coating regions 22 , 24 may be separated or spaced apart.
  • the second coating region 24 comprises a third coating composition 50 , which may form a layer, disposed over a fourth coating composition 60 .
  • the third coating composition 50 comprises a second therapeutic agent 52 , which may be the same as the first therapeutic agent 42 of the second coating composition 40 .
  • the third coating composition 50 can also include a third polymer 54 , which can be the same as the first polymer 34 or the second polymer 44 .
  • the third coating composition 50 or the second coating region 24 is substantially free of any adhesion promoter, i.e.
  • the second coating composition 40 and third coating composition 50 can be the same, i.e. contain the same constitutes in the same amounts.
  • the fourth coating composition 60 may form a layer. In some instances, the fourth coating composition 60 forms a first layer and the third coating composition 50 forms a second layer disposed over the first layer.
  • the fourth coating composition 60 comprises a second adhesion promoter 62 , which may be the same as or different from the first adhesion promoter 32 of the first coating composition 30 .
  • the fourth coating composition 60 can include a fourth polymer 64 , which can be the same as the first polymer 34 or the second polymer 44 or the third polymer 54 .
  • the fourth coating composition 60 is substantially free of any adhesion promoter, i.e. contains less than 1% by weight of the adhesion promoter or any adhesion promoter, or is free of any adhesion promoter.
  • FIG. 7 shows another embodiment of coated medical device of the present invention.
  • a medical device 10 comprises a first region 12 and a second region 14 .
  • a first coating region 22 comprises a first coating composition 30 , which can form a layer.
  • the first coating composition 30 comprises an adhesion promoter 32 and optionally a first polymer, and a first therapeutic agent 42 .
  • the first coating region 22 can include one or more additional layers of coating compositions with either adhesion promoters, polymers, and/or therapeutic agents.
  • the second coating region 24 of the coating comprises a second coating composition 40 , which may form a layer.
  • the second coating composition 40 comprises a second adhesion promoter 52 , which may be the same as the first adhesion promoter 32 of the first coating composition 30 .
  • the second coating composition 40 can include a second therapeutic agent 62 , which may be the same as or different from the first therapeutic agent 42 .
  • the second coating composition 40 can also include a polymer, which can be the same as the polymer in the first composition.
  • the second coating region can include one or more additional layers of coating compositions with either adhesion promoters, polymers, and/or therapeutic agents.
  • the coated medical devices of the present invention can be inserted and implanted in the body of a patient.
  • Medical devices suitable for the present invention include, but are not limited to, stents, surgical staples, catheters, such as balloon catheters, central venous catheters, and arterial catheters, guidewires, cannulas, cardiac pacemaker leads or lead tips, cardiac defibrillator leads or lead tips, implantable vascular access ports, blood storage bags, blood tubing, vascular or other grafts, intra aortic balloon pumps, heart valves, cardiovascular sutures, total artificial hearts and ventricular assist pumps, and extra corporeal devices such as blood oxygenators, blood filters, septal defect devices, hemodialysis units, hemoperfusion units and plasmapheresis units.
  • Medical devices suitable for the present invention include those that have a tubular or cylindrical like portion.
  • the tubular portion of the medical device need not be completely cylindrical.
  • the cross section of the tubular portion can be any shape, such as rectangle, a triangle, etc., not just a circle.
  • Such devices include, without limitation, stents, balloon catheters, and grafts.
  • a bifurcation stent is also included among the medical devices which can be fabricated by the method of the present invention.
  • Medical devices that are particularly suitable for the present invention include any kind of stent for medical purposes which is known to the skilled artisan.
  • the stents are intravascular stents that are designed for permanent implantation in a blood vessel of a patient and that have a sidewall stent structure having openings therein.
  • Suitable intravascular stents include self expanding stents and balloon expandable stents. Examples of self expanding stents useful in the present invention are illustrated in U.S. Pat. Nos. 4,655,771 and 4,954,126 issued to Wallsten and U.S. Pat. No. 5,061,275 issued to Wallsten et al. Examples of appropriate balloon expandable stents are shown in U.S. Pat. No.
  • the stent suitable for the present invention is an Express stent. More preferably, the Express stent is an ExpressTM stent or an Express2TM stent (Boston Scientific, Inc. Natick, Mass.).
  • Medical devices that are suitable for the present invention may be fabricated from metallic, ceramic, or polymeric materials, or a combination thereof.
  • the materials are biocompatible.
  • Metallic material is more preferable. Suitable metallic materials include metals and alloys based on titanium (such as nitinol, nickel titanium alloys, thermo memory alloy materials), stainless steel, tantalum, nickel chrome, or certain cobalt alloys including cobalt chromium nickel alloys such as Elgiloy® and Phynox®.
  • Metallic materials also include clad composite filaments, such as those disclosed in WO 94/16646.
  • Suitable ceramic materials include, but are not limited to, oxides, carbides, or nitrides of the transition elements such as titanium oxides, hafnium oxides, iridiumoxides, chromium oxides, aluminum oxides, and zirconiumoxides. Silicon based materials, such as silica, may also be used.
  • the polymeric material may be biostable. Also, the polymeric material may be biodegradable.
  • Suitable polymeric materials include, but are not limited to, styrene isobutylene styrene, polyetheroxides, polyvinyl alcohol, polyglycolic acid, polylactic acid, polyamides, poly-2-hydroxy-butyrate, polycaprolactone, poly(lactic-co-clycolic)acid, and Teflon.
  • Polymeric materials may be used for forming the medical device in the present invention include without limitation isobutylene-based polymers, polystyrene-based polymers, polyacrylates, and polyacrylate derivatives, vinyl acetate-based polymers and its copolymers, polyurethane and its copolymers, silicone and its copolymers, ethylene vinyl-acetate, polyethylene terephtalate, thermoplastic elastomers, polyvinyl chloride, polyolefins, cellulosics, polyamides, polyesters, polysulfones, polytetrafluorethylenes, polycarbonates, acrylonitrile butadiene styrene copolymers, acrylics, polylactic acid, polyglycolic acid, polycaprolactone, polylactic acid-polyethylene oxide copolymers, cellulose, collagens, and chitins.
  • polymers that are useful as materials for medical devices include without limitation dacron polyester, poly(ethylene terephthalate), polycarbonate, polymethylmethacrylate, polypropylene, polyalkylene oxalates, polyvinylchloride, polyurethanes, polysiloxanes, nylons, poly(dimethyl siloxane), polycyanoacrylates, polyphosphazenes, poly(amino acids), ethylene glycol I dimethacrylate, poly(methyl methacrylate), poly(2-hydroxyethyl methacrylate), polytetrafluoroethylene poly(HEMA), polyhydroxyalkanoates, polytetrafluorethylene, polycarbonate, poly(glycolide-lactide) co-polymer, polylactic acid, poly( ⁇ -caprolactone), poly( ⁇ -hydroxybutyrate), polydioxanone, poly( ⁇ -ethyl glutamate), polyiminocarbonates, poly(ortho ester), polyanhydrides, alginate,
  • Non-polymeric materials include sterols such as cholesterol, stigmasterol, ⁇ -sitosterol, and estradiol; cholesteryl esters such as cholesteryl stearate; C 12 -C 24 fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid; C 18 -C 36 mono-, di- and triacylglycerides such as glyceryl monooleate, glyceryl monolinoleate, glyceryl monolaurate, glyceryl monodocosanoate, glyceryl monomyristate, glyceryl monodicenoate, glyceryl dipalmitate, glyceryl didocosanoate, glyceryl dimyristate, glyceryl didecenoate, glycerols such as cholesterol, stigmasterol, ⁇ -sito
  • Preferred non-polymeric materials include cholesterol, glyceryl monostearate, glycerol tristearate, stearic acid, stearic anhydride, glyceryl monooleate, glyceryl monolinoleate, and acetylated monoglycerides.
  • therapeutic agent encompasses drugs, genetic materials, and biological materials and can be used interchangeably with “biologically active material”.
  • the therapeutic agent is an anti-restenotic agent.
  • the therapeutic agent inhibits smooth muscle cell proliferation, contraction, migration or hyperactivity.
  • Non-limiting examples of suitable therapeutic agent include heparin, heparin derivatives, urokinase, dextrophenylalanine proline arginine chloromethylketone (PPack), enoxaprin, angiopeptin, hirudin, acetylsalicylic acid, tacrolimus, everolimus, rapamycin (sirolimus), pimecrolimus, amlodipine, doxazosin, glucocorticoids, betamethasone, dexamethasone, prednisolone, corticosterone, budesonide, sulfasalazine, rosiglitazone, mycophenolic acid, mesalamine, paclitaxel, 5-fluorouracil, cisplatin, vinblastine, vincristine, epothilones, methotrexate, azathioprine, adriamycin, mutamycin, endostatin, an
  • AbraxaneTM 2′-succinyl-taxol, 2′-succinyl-taxol triethanolamine, 2′-glutaryl-taxol, 2′-glutaryl-taxol triethanolamine salt, 2′-O-ester with N-(dimethylaminoethyl) glutamine, 2′-O-ester with N-(dimethylaminoethyl) glutamide hydrochloride salt, nitroglycerin, nitrous oxides, nitric oxides, antibiotics, aspirins, digitalis, estrogen, estradiol and glycosides.
  • the therapeutic agent is a smooth muscle cell inhibitor or antibiotic.
  • the therapeutic agent is taxol (e.g., Taxol®), or its analogs or derivatives.
  • the therapeutic agent is paclitaxel, or its analogs or derivatives.
  • the therapeutic agent is an antibiotic such as erythromycin, amphotericin, rapamycin, adriamycin, etc.
  • genetic materials means DNA or RNA, including, without limitation, of DNA/RNA encoding a useful protein stated below, intended to be inserted into a human body including viral vectors and non-viral vectors.
  • biological materials include cells, yeasts, bacteria, proteins, peptides, cytokines and hormones.
  • peptides and proteins include vascular endothelial growth factor (VEGF), transforming growth factor (TGF), fibroblast growth factor (FGF), epidermal growth factor (EGF), cartilage growth factor (CGF), nerve growth factor (NGF), keratinocyte growth factor (KGF), skeletal growth factor (SGF), osteoblast-derived growth factor (BDGF), hepatocyte growth factor (HGF), insulin-like growth factor (IGF), cytokine growth factors (CGF), platelet-derived growth factor (PDGF), hypoxia inducible factor-1 (HIF-1), stem cell derived factor (SDF), stem cell factor (SCF), endothelial cell growth supplement (ECGS), granulocyte macrophage colony stimulating factor (GM-CSF), growth differentiation factor (GDF), integrin modulating factor (IMF), calmodulin (CaM), thymidine kinase (VEGF),
  • BMP's are BMP-2, BMP-3, BMP-4, BMP-5, BMP-6, BMP-7.
  • These dimeric proteins can be provided as homodimers, heterodimers, or combinations thereof, alone or together with other molecules.
  • Cells can be of human origin (autologous or allogeneic) or from an animal source (xenogeneic), genetically engineered, if desired, to deliver proteins of interest at the transplant site.
  • the delivery media can be formulated as needed to maintain cell function and viability.
  • Cells include progenitor cells (e.g., endothelial progenitor cells), stem cells (e.g., mesenchymal, hematopoietic, neuronal), stromal cells, parenchymal cells, undifferentiated cells, fibroblasts, macrophage, and satellite cells.
  • progenitor cells e.g., endothelial progenitor cells
  • stem cells e.g., mesenchymal, hematopoietic, neuronal
  • stromal cells e.g., parenchymal cells, undifferentiated cells, fibroblasts, macrophage, and satellite cells.
  • non-genetic therapeutic agents include:
  • vascular cell growth promoters such as growth factors, vascular endothelial growth factors (VEGF, all types including VEGF-2), growth factor receptors, transcriptional activators, and translational promoters;
  • Preferred biological materials include anti-proliferative drugs such as steroids, vitamins, and restenosis-inhibiting agents.
  • Preferred restenosis-inhibiting agents include microtubule stabilizing agents such as Taxol®, paclitaxel (i.e., paclitaxel, paclitaxel analogs, or paclitaxel derivatives, and mixtures thereof).
  • derivatives suitable for use in the present invention include 2′-succinyl-taxol, 2′-succinyl-taxol triethanolamine, 2′-glutaryl-taxol, 2′-glutaryl-taxol triethanolamine salt, 2′-O-ester with N-(dimethylaminoethyl) glutamine, and 2′-O-ester with N-(dimethylaminoethyl) glutamide hydrochloride salt.
  • Suitable therapeutic agents include tacrolimus; halofuginone; inhibitors of HSP90 heat shock proteins such as geldanamycin; microtubule stabilizing agents such as epothilone D; phosphodiesterase inhibitors such as cliostazole; Barkct inhibitors; phospholamban inhibitors; and Serca 2 gene/proteins.
  • nitroglycerin nitrous oxides, nitric oxides, aspirins, digitalis, estrogen derivatives such as estradiol and glycosides.
  • the therapeutic agent is capable of altering the cellular metabolism or inhibiting a cell activity, such as protein synthesis, DNA synthesis, spindle fiber formation, cellular proliferation, cell migration, microtubule formation, microfilament formation, extracellular matrix synthesis, extracellular matrix secretion, or increase in cell volume.
  • a cell activity such as protein synthesis, DNA synthesis, spindle fiber formation, cellular proliferation, cell migration, microtubule formation, microfilament formation, extracellular matrix synthesis, extracellular matrix secretion, or increase in cell volume.
  • the therapeutic agent is capable of inhibiting cell proliferation and/or migration.
  • the therapeutic agents for use in the medical devices of the present invention can be synthesized by methods well known to one skilled in the art.
  • the therapeutic agents can be purchased from chemical and pharmaceutical companies.
  • the therapeutic agent comprises at least 5%, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, at least 97%, at least 99% or more by weight of the coating composition.
  • the therapeutic agent is about 0.01 to about 60 percent by weight of the coating composition that contains the therapeutic agent. More preferably, the therapeutic agent is about 5 to about 60 percent by weight of the coating composition that contains the therapeutic agent.
  • Polymers useful for forming the coating compositions should be ones that are biocompatible, particularly during insertion or implantation of the device into the body and avoids irritation to body tissue.
  • examples of such polymers include, but not limited to, polyurethanes, polyisobutylene and its copolymers, silicones, and polyesters.
  • polystyrene copolymers include polyolefins, polyisobutylene, ethylene-alphaolefin copolymers, acrylic polymers and copolymers, vinyl halide polymers and copolymers such as polyvinyl chloride, polyvinyl ethers such as polyvinyl methyl ether, polyvinylidene halides such as polyvinylidene fluoride and polyvinylidene chloride, polyacrylonitrile, polyvinyl ketones, polyvinyl aromatics such as polystyrene, polyvinyl esters such as polyvinyl acetate; copolymers of vinyl monomers, copolymers of vinyl monomers and olefins such as ethylene-methyl methacrylate copolymers, acrylonitrile-styrene copolymers, ABS resins, ethylene-vinyl acetate copolymers, polyamides such as Nylon 66 and polycaprolactone, alkyd resins
  • the polymers are preferably selected from elastomeric polymers such as silicones (e.g. polysiloxanes and substituted polysiloxanes), polyurethanes, thermoplastic elastomers, ethylene vinyl acetate copolymers, polyolefin elastomers, and EPDM rubbers.
  • elastomeric polymers such as silicones (e.g. polysiloxanes and substituted polysiloxanes), polyurethanes, thermoplastic elastomers, ethylene vinyl acetate copolymers, polyolefin elastomers, and EPDM rubbers.
  • the polymer is selected to allow the coating to better adhere to the surface of the strut when the stent is subjected to forces or stress.
  • the coating can be formed by using a single type of polymer, various combinations of polymers can be employed.
  • hydrophilic therapeutic agent when used then a hydrophilic polymer having a greater affinity for the therapeutic agent than another material that is less hydrophilic is preferred.
  • hydrophobictherapeutic agent when used then a hydrophobic polymer having a greater affinity for the therapeutic agent is preferred.
  • hydrophobic polymers or monomers include, but not limited to, polyolefins, such as polyethylene, polypropylene, poly(1-butene), poly(2-butene), poly(1-pentene), poly(2-pentene), poly(3-methyl-1-pentene), poly(4-methyl-1-pentene), poly(isoprene), poly(4-methyl-1-pentene), ethylene-propylene copolymers, ethylene-propylene-hexadiene copolymers, ethylene-vinyl acetate copolymers, blends of two or more polyolefins and random and block copolymers prepared from two or more different unsaturated monomers; styrene polymers, such as poly(styrene), poly(2-methylstyrene), styrene-acrylonitrile copolymers having less than about 20 mole-percent acrylonitrile, and styrene-2,2,3,3,-te
  • hydrophilic polymers or monomers include, but not limited to; (meth)acrylic acid, or alkaline metal or ammonium salts thereof; (meth)acrylamide; (meth)acrylonitrile; those polymers to which unsaturated dibasic, such as maleic acid and fumaric acid or half esters of these unsaturated dibasic acids, or alkaline metal or ammonium salts of these dibasic adds or half esters, is added; those polymers to which unsaturated sulfonic, such as 2-acrylamido-2-methylpropanesulfonic, 2-(meth)acryloylethanesulfonic acid, or alkaline metal or ammonium salts thereof, is added; and 2-hydroxyethyl (meth)acrylate and 2-hydroxypropyl (meth)acrylate.
  • unsaturated dibasic such as maleic acid and fumaric acid or half esters of these unsaturated dibasic acids, or alkaline metal or ammonium salts of these dibasic adds
  • Polyvinyl alcohol is also an example of hydrophilic polymer.
  • Polyvinyl alcohol may contain a plurality of hydrophilic groups such as hydroxyl, amido, carboxyl, amino, ammonium or sulfonyl (—SO3).
  • Hydrophilic polymers also include, but are not limited to, starch, polysaccharides and related cellulosic polymers; polyalkylene glycols and oxides such as the polyethylene oxides; polymerized ethylenically unsaturated carboxylic acids such as acrylic, mathacrylic and maleic acids and partial esters derived from these acids and polyhydric alcohols such as the alkylene glycols; homopolymers and copolymers derived from acrylamide; and homopolymers and copolymers of vinylpyrrolidone.
  • Materials that can be used as adhesion promoters in the present invention include those that are capable of reducing the release rate of a therapeutic agent from a coating as compared to the release of that therapeutic agent absent the adhesion promoter, including but not limited to copolymers of styrene and ethylene/butylene, iridium oxide and sulfonated styrene isobutylene copolymers.
  • the adhesion promoter comprises at least 5%, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, at least 97%, at least 99% or more by weight of the coating composition that contains the adhesion promoter.
  • the adhesion promoter is less than about 10 percent by weight of the coating composition that contains the adhesion promoter. More preferably, the adhesion promoter is about 1 to about 5 percent by weight of the coating composition that contains the adhesion promoter. In some embodiments the weight percent of the adhesion promoter will be different between the different coating compositions. In specific embodiments, the weight percent of the adhesion promoter will be different between the different coating regions.
  • Coating compositions can be applied by any method to a surface of a medical device.
  • suitable methods include, but are not limited to, spraying such as by conventional nozzle or ultrasonic nozzle, dipping, rolling, electrostatic deposition, and a batch process such as air suspension, pan coating or ultrasonic mist spraying.
  • more than one coating method can be used to make a medical device.
  • the constituents of the coating composition can be dissolved or suspended in a solvent. After application to the medical device, the solvent is removed, e.g. evaporated.

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